diff --git a/sklearn/ensemble/_forest.py b/sklearn/ensemble/_forest.py
index 3e5efd7b0..728f944be 100644
--- a/sklearn/ensemble/_forest.py
+++ b/sklearn/ensemble/_forest.py
@@ -2338,14 +2338,14 @@ class ExtraTreesRegressor(ForestRegressor):
 
     Attributes
     ----------
-    estimator_ : :class:`~sklearn.tree.ExtraTreeRegressor`
+    estimator_ : :class:`~sklearn.tree.ExtraTreeRegressor` instance
         The child estimator template used to create the collection of fitted
         sub-estimators.
 
         .. versionadded:: 1.2
            `base_estimator_` was renamed to `estimator_`.
 
-    base_estimator_ : ExtraTreeRegressor
+    base_estimator_ : :class:`~sklearn.tree.ExtraTreeRegressor` instance
         The child estimator template used to create the collection of fitted
         sub-estimators.
 
@@ -2379,7 +2379,7 @@ class ExtraTreesRegressor(ForestRegressor):
         .. versionadded:: 1.0
 
     n_outputs_ : int
-        The number of outputs.
+        The number of outputs when ``fit`` is performed.
 
     oob_score_ : float
         Score of the training dataset obtained using an out-of-bag estimate.
